Mining-machine grizzly.



0. H. BRIGGS.

MINING MACHINE GRIZZLY.

APPLICATION FILED MAR.24,1911.

Patented June 2,1914.

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0. H. BRIGGS. MINING MACHINE GRIZZLY. APPLIOATION FILED MAR. 24, 1911.

Patented June 2, 1914.

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TE STATUES PATENT FFTCE.

OSCAR H. BRIGGS, OF PROVIDENCE, RHODE ISLAND.

MINING-MACHINE GRIZZLY.

To all whom it may concern Be it known that I, OSCAR H. Braces, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Mining-Machine Grizzlies, of which the following is a specification.

This invention relates more particularly to improved means, including a. bargrizzly, for mechanically separating and washing gold-bearing ore, as for example, sand, gravel, etc., and it consists in the construction and combination of parts, substantially as herein set forth and claimed.

In the accompanying two sheets of drawings, my improvement is illustrated as employed in an organized machine arranged for placer mining, and in which- Figure 1 is a vertical sectional view longitudinally of the machine, showing the relative arrangement of my improved grizzly, washing means, etc; Fig. 2 is a perspective view of the grizzly in a modified form, some of the supporting members being omitted; Fig. 3 is a transverse sectional view, showing more in detail the preferred construc tion and manner of mounting the grizzly; Fig. 4 is a partial top plan view, showing a manner of linking the grizzly bars together; and Fig. 5 is a transverse section, taken through the upper portion of Fig. 1 on line 5-5.

In order to more clearly show the relation of my improved grizzly in an organized mining machine of the traction type, the latter may be provided with a main frame or housing A. carrying the major portion of the mechanism and accessories; the frame is hinged at p to the truck-base 79 having traction wheels 79 To the front end of the frame is hinged a loading device B (portions being omitted) having a power-actuated conveyer-belt 8 arranged to discharge the ore or material onto an inclined partition 6 leading to the upper side or run of the bar-grizzly D, later described. The grizzly is power-propelled in a horizontal direction; the washed and disintegrated material, together with the more or less ore-charged wash water, passes downward through the grizzly and is deflected by the diverging sides of a stationary member G into right and left inclined open lateral troughs communicat-ing with a center spout g which discharges into the front end of an inclined Specification of Letters Patent.

Application filed March 24, 1911.

Patented June 9!, 1914-.

Serial No. 616,636.

revolublymounted combined screen F and clay-separator F The refuse or screenings flow into suitable chutes m, u, arranged to lead to the waste dump, while the concentrated I or liner value-carrying material passes through the perforations of the revolving screen into an individual pan l located immediately below it and into a pocket .6 formed in the lower end of the pan, and

from the pocket into a treating tank K or other suitable place of discharge, as for example, a sluice box. The pan I may be provided with a series of spaced ritlle-plates or metal bars 0;, capable of slight vibratory movement. I make no claim herewith to the latter.

My improved bar-grizzly D is mounted on revoluble sprocket wheels c actuated by a motor D The grizzly consists of a series of laterally spaced metal bars connected together by side links and forming on each side parallel endless chains (Z (Z See Figs. 3 and 1-. Each bar comprises a center axle (Z, a small wheel d secured to each end of the axle, an intermediate tube (Z through which the axle extends, and an outer steel tube (i enveloping said tube (Z To the opposed inner sides of the upper housing E and contiguous to the upper run of the grizzly are. secured grooved supporting brackets (Z in which the said wheels (Z are arranged to revolve concurrently with the propelled grizzly. See Fig. 8. As thus constructed, the outer sections of tube (i may be removed when excessively worn and new sections substituted. The arrangement causes a frictional rotation of the tubes (Z individually in the same direction as that of the grizzly itself, thus, to some extent, insuring uniformity in the wear of the tubes surface, while at the same time operating to feed the machine through the openings between the sections.

The wheels (Z and also the links of the chains (Z of the grizzly are maintained in position against lateral separation by any suitable means, as for example, by cotterpins inserted in holes 6 formed in the ends of the axles (l, thereby facilitating the renewal of bent and worn out parts. Obviously, the weight of the material on the upper run of the traveling grizzly, in cooperation with the circumference of each pair of wheels (Z of the respective bars tem bars. The tube members (Z (Z are capable of rotary movement in either direction, since they are not rigidly fixed to the axle.

The front transverse partition 6 of the upper housing E is inclined upwardly and extends to or nearly to the delivery end of the conveyer-belt s, so that all the material discharged from the belt slides downward by gravity onto the continuously traveling grizzly; pieces too large to pass through the grizzly are washed by jets of water directed upon them before they are discharged from the rear end into a receptacle at leading to the waste dump. Means for thus washing the gold-carrying material consists of a suitably connected water main M having oppositely disposed controlled lateral branches m leading downward therefrom and through the respective sides of the upper housing E and through longitudinally extending fixed inclined guide and protector plates m arranged above and contiguous to the respective edges of the upper run of the grizzly. See Fig. 3. At the same time a stream of water discharged from a branch pipe m of the main M onto the advancing material causes the latter to be surfacewashed before the larger pieces are discharged in the recept-able m, substantially as before stated.

Piping t may be arranged to connect with the main M for conducting water into the revoluble screens F, F to further assist in the separation or disintegration of the material being acted upon. Practically all the water discharged from the main is finally collected in the tank K, mingled with the finer particles of the thus acted upon material.

I claim:

1. A bar-grizzly of the general character described, the same consisting of a series of spaced, individual bar members, a pair of laterally separated endless chains having the respective ends of said bars mounted for ro tation in links of the chains, small truckrolls secured to the bars, revoluble sprocketwheels arranged to support the opposed ends of the grizzly, and relatively stationary parallel bracket members arranged to support the upper run of the grizzly, the support at the same time forming a traction surface for the said truck-rolls.

2. In a bar-grizzly, a pair of parallel. endless side chains, a plurality of spaced bars, each bar provided with a revoluble center axle member extending across the width of the grizzly and having its ends mounted in said side chains, a wear tube capable of independent rotation loosely mounted on said axle, means for normally propelling the grizzly, and means for revolving the axles of the bars of the upper run of the grizzly while the latter is being actuated.

3. In a bar-grizzly arranged to be propelled, the combination of a pair of supported parallel endless side chains, a plurality of spaced bars, each bar provided with a revoluble center axle member extending transversely across the grizzly, the ends of the axle being mounted in links of said side chains, an inner tube interposed between the chains and revolubly supported on the axle, an outer tube concentric with and revolubly supported on said inner tube, and means for revolvin a number of the axles during the forward movement of the grizzly.

4. As an improved article of manufacture, an endless bar-grizzly device for mining machines, said grizzly consisting of a plurality of transversely arranged bars connected together in a chain-like manner, each of said bars having a center axle arranged to revolve on its longitudinal axis, and means arranged to cooperate with a stationary element and with the axle for turning the latter to agitate and feed the ore or material downwardly between the bars of the grizzly while the latter is being normally propelled.

In testimony whereof I have afiixed my signature in presence of two witnesses.

OSCAR H. BRIGGS.

Witnesses:

GEO. H. REMINGTON, JOHN T. CUDDY.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. C. 

